mirror of
https://github.com/0ldsk00l/nestopia.git
synced 2025-04-02 10:31:51 -04:00
106 lines
2.9 KiB
C++
106 lines
2.9 KiB
C++
////////////////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Nestopia - NES/Famicom emulator written in C++
|
|
//
|
|
// Copyright (C) 2021 Rupert Carmichael
|
|
//
|
|
// This file is part of Nestopia.
|
|
//
|
|
// Nestopia is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 2 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// Nestopia is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with Nestopia; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
//
|
|
////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include "NstBoard.hpp"
|
|
#include "NstBoardWaixing.hpp"
|
|
|
|
// Reference: https://github.com/TASVideos/fceux/blob/master/src/boards/164.cpp
|
|
|
|
namespace Nes
|
|
{
|
|
namespace Core
|
|
{
|
|
namespace Boards
|
|
{
|
|
namespace Waixing
|
|
{
|
|
|
|
void Fs304::SubReset(bool)
|
|
{
|
|
Map( 0x5000U, 0x5FFFU, &Fs304::Poke_5000 );
|
|
|
|
regs[0] = 0x3;
|
|
regs[1] = 0x0;
|
|
regs[2] = 0x0;
|
|
regs[3] = 0x7;
|
|
|
|
UpdatePrg();
|
|
}
|
|
|
|
void Fs304::SubSave(State::Saver& state) const
|
|
{
|
|
const byte data[4] = { regs[0], regs[1], regs[2], regs[3] };
|
|
state.Begin( AsciiId<'3','0','4'>::V ).Begin( AsciiId<'R','E','G'>::V ).Write( data ).End().End();
|
|
}
|
|
|
|
void Fs304::SubLoad(State::Loader& state,const dword baseChunk)
|
|
{
|
|
NST_VERIFY( baseChunk == (AsciiId<'3','0','4'>::V) );
|
|
|
|
if (baseChunk == AsciiId<'3','0','4'>::V)
|
|
{
|
|
while (const dword chunk = state.Begin())
|
|
{
|
|
if (chunk == AsciiId<'R','E','G'>::V)
|
|
{
|
|
State::Loader::Data<4> data( state );
|
|
|
|
regs[0] = data[0];
|
|
regs[1] = data[1];
|
|
regs[2] = data[2];
|
|
regs[3] = data[3];
|
|
}
|
|
|
|
state.End();
|
|
}
|
|
}
|
|
}
|
|
|
|
void Fs304::UpdatePrg()
|
|
{
|
|
switch (regs[3] & 0x5) {
|
|
case 0:
|
|
prg.SwapBank<SIZE_32K>( 0x0000, ((regs[0] & 0xC) | (regs[1] & 0x2) | ((regs[2] & 0xF) << 4)) );
|
|
break;
|
|
case 1:
|
|
prg.SwapBank<SIZE_32K>( 0x0000, ((regs[0] & 0xC) | (regs[2] & 0xF) << 4) );
|
|
break;
|
|
case 4:
|
|
prg.SwapBank<SIZE_32K>( 0x0000, ((regs[0] & 0xE) | ((regs[1] >> 1) & 0x1) | ((regs[2] & 0xF) << 4)) );
|
|
break;
|
|
case 5:
|
|
prg.SwapBank<SIZE_32K>( 0x0000, ((regs[0] & 0xF) | ((regs[2] & 0xF) << 4)) );
|
|
break;
|
|
}
|
|
}
|
|
|
|
NES_POKE_AD(Fs304,5000)
|
|
{
|
|
regs[(address >> 8) & 0x3] = data;
|
|
UpdatePrg();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|